The Swampling is a creature that lives in a cave near a lake. He has inherited the secret generations-old recipe of the Swamp Stew (whose main ingredient is swamp mud) which is handed down from Swampling to Swampling.
The Swampling is a very solitary character and spoke with a strange grammar. He celebrated his birthday 2 weeks before Simon visited him, and although he didn't have any friends, he still hoped that visitors would show up later. Once Simon came, he was forced to taste some of his Swamp Stew to make the Swampling stop moaning and whining. Simon escaped while the Swampling was serving him more stew.